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A Wire-overhead-free Reset Propagation Scheme for Millimeter-scale Sensor Systems
Lee, Inhee,Bang, Suyoung,Kim, Yejoong,Kim, Gyouho,Sylvester, Dennis,Blaauw, David,Lee, Yoonmyung The Institute of Electronics and Information Engin 2017 Journal of semiconductor technology and science Vol.17 No.4
This paper presents a novel reset scheme for mm-scale sensing systems with stringent volume and area constraints. In such systems, multi-layer structure is required to maximize the silicon area per volume and minimize the system size. The multi-layer structure requires wirebonding connections for power delivery and communication among layers, but the area overhead for wirebonding pads can be significant. The proposed reset scheme exploits already existing power wires and thus does not require additional wires for system-wide reset operation. To implement the proposed reset scheme, a power management unit is designed to impose reset condition, and a reset detector is designed to interpret the reset condition indicated by the power wires. The reset detector uses a coupling capacitor for the initial power-up and a feedback path to hold the developed supply voltage. The prototype reset detector is fabricated in a $180-{\mu}m$ CMOS process, and the measurement results with the prototype mm-scale system confirmed robust reset operation over a wide range of temperatures and voltages.
MBus : A Fully Synthesizable Low-power Portable Interconnect Bus for Millimeter-scale Sensor Systems
Inhee Lee,Ye-Sheng Kuo,Pat Pannuto,Gyouho Kim,Zhiyoong Foo,Ben Kempke,Seokhyeon Jeong,Yejoong Kim,Prabal Dutta,David Blaauw,Yoonmyung Lee 대한전자공학회 2016 Journal of semiconductor technology and science Vol.16 No.6
This paper presents a fully synthesizable low power interconnect bus for millimeter-scale wireless sensor nodes. A segmented ring bus topology minimizes the required chip real estate with low input/output pad count for ultra-small form factors. By avoiding the conventional open drain-based solution, the bus can be fully synthesizable. Low power is achieved by obviating a need for local oscillators in member nodes. Also, aggressive power gating allows low-power standby mode with only 53 gates powered on. An integrated wakeup scheme is compatible with a power management unit that has nW standby mode. A 3-module system including the bus is fabricated in a 180 nm process. The entire system consumes 8 nW in standby mode, and the bus achieves 17.5 pJ/bit/chip.
A Wire-overhead-free Reset Propagation Scheme for Millimeter-scale Sensor Systems
Inhee Lee,Suyoung Bang,Yejoong Kim,Gyouho Kim,Dennis Sylvester,David Blaauw,Yoonmyung Lee 대한전자공학회 2017 Journal of semiconductor technology and science Vol.17 No.4
This paper presents a novel reset scheme for mm-scale sensing systems with stringent volume and area constraints. In such systems, multi-layer structure is required to maximize the silicon area per volume and minimize the system size. The multi-layer structure requires wirebonding connections for power delivery and communication among layers, but the area overhead for wirebonding pads can be significant. The proposed reset scheme exploits already existing power wires and thus does not require additional wires for system-wide reset operation. To implement the proposed reset scheme, a power management unit is designed to impose reset condition, and a reset detector is designed to interpret the reset condition indicated by the power wires. The reset detector uses a coupling capacitor for the initial power-up and a feedback path to hold the developed supply voltage. The prototype reset detector is fabricated in a 180-μm CMOS process, and the measurement results with the prototype mm-scale system confirmed robust reset operation over a wide range of temperatures and voltages.
MBus: A Fully Synthesizable Low-power Portable Interconnect Bus for Millimeter-scale Sensor Systems
Lee, Inhee,Kuo, Ye-Sheng,Pannuto, Pat,Kim, Gyouho,Foo, Zhiyoong,Kempke, Ben,Jeong, Seokhyeon,Kim, Yejoong,Dutta, Prabal,Blaauw, David,Lee, Yoonmyung The Institute of Electronics and Information Engin 2016 Journal of semiconductor technology and science Vol.16 No.6
This paper presents a fully synthesizable low power interconnect bus for millimeter-scale wireless sensor nodes. A segmented ring bus topology minimizes the required chip real estate with low input/output pad count for ultra-small form factors. By avoiding the conventional open drain-based solution, the bus can be fully synthesizable. Low power is achieved by obviating a need for local oscillators in member nodes. Also, aggressive power gating allows low-power standby mode with only 53 gates powered on. An integrated wakeup scheme is compatible with a power management unit that has nW standby mode. A 3-module system including the bus is fabricated in a 180 nm process. The entire system consumes 8 nW in standby mode, and the bus achieves 17.5 pJ/bit/chip.